/Engine/Source/Editor/UnrealEd/Public/GraphEditor.h
typedef TBaseDelegate_ThreeParams< void, const [TArray](API\Runtime\Core\Containers\TArray)< [TWeakObjectPtr](API\Runtime\Core\UObject\TWeakObjectPtr)< class [ULevelStreaming](API\Runtime\Engine\Engine\ULevelStreaming) > > &, class [UEdGraph](API\Runtime\Engine\EdGraph\UEdGraph) *, const FVector2D & > FOnDropStreamingLevel